If you're interested in seeing auroras
or knowing about solar flares and radiation
storms, this package is for you. Subscribers will receive the following kinds
of phone calls:

* Aurora warnings: Sometimes
we can predict geomagnetic storms two days in advance, for example when
a coronal mass ejection is heading for Earth. In such cases we'll call
you with a warning that auroras could appear within 48 hours.

* Geomagnetic storms: We'll also call you
when a geomagnetic storm is in progress, but only if it's strong enough
to produce auroras over your location. These alerts are based on measurements
of the planetary K index or "Kp" -- a number that tells us
how much Earth's magnetic field is shaking. Kp ranges from 0 (no storm)
to 9 (severe storming). When you sign up for Spaceweather PHONE, we'll
chose the value of Kp that's right for your location--or you can set
it yourself by logging into your account and modifying your preferences.
You're in control.

* X-class solar flares: X-class solar flares
can cause radio blackouts, cell phone static, and they are often the
first sign of a impending solar radiation storm. We'll phone you just
minutes after Earth-orbiting satellites detect one of these powerful
explosions on the Sun. You can enable or disable these alerts, according
to your interest in them, by logging into your Spaceweather Phone account
and adjusting your preferences.

* CMEs and solar wind gusts: When a coronal
mass ejection sweeps by Earth, raising the solar wind velocity by more
than 150 km/s, we'll call you. Solar wind gusts will also trigger this
alert. You can enable or disable this alert by logging into your SpaceWeather
Phone account and adjusting your preferences.

* The Interplanetary Magnetic Field: The interplanetary
magnetic field (IMF) near Earth strongly influences the likelihood of
auroras. When the IMF tilts south, which can happen at unexpected times
for no apparent reason, intense auroras often appear. We'll phone you
when the IMF tilts south (-10 nT) for three hours or more and let you
know that you should step out side and look for Northern (or Southern)
Lights. You can enable or disable these alerts, according to your interest
in them, by logging into your Spaceweather Phone account and adjusting
your preferences.

* Solar radiation storms: Explosions on the
Sun, like solar flares and coronal mass ejections, sometimes hurl highly
energetic particles toward Earth. When swarms of such particles surround
our planet, we call it a "radiation storm." Solar radiation
storms are divided into five categories: S1 is the weakest and poses
no danger to people on Earth. S5 is the strongest. An S5 storm can knock
out satellites and expose air travellers to harmful doses of radiation.
We'll phone you the instant Earth-orbiting satellites detect an ongoing
radiation of category S4 or above. You can enable or disable these alerts,
according to your interest in them, by logging into your Spaceweather
Phone account and adjusting your preferences.